/Engine/Source/Runtime/RenderCore/Public/RenderGraphBuilder.h
Register a external buffer to be tracked by the render graph.
FRDGBufferRef RegisterExternalBuffer ( const [TRefCountPtr](API\Runtime\Core\Templates\TRefCountPtr)< [FRDGPooledBuffer](API\Runtime\RenderCore\FRDGPooledBuffer) > & ExternalPooledBuffer, ERDGBufferFlags Flags )